Floor spring with door opening and closing strength adjusting and multi-point positioning functions

Abstract

The invention relates to a floor spring with door opening and closing strength adjusting and multi-point positioning functions. The floor spring comprises a valve body and a center shaft. Two ends of a valve chamber are provided with a piston, a rear cover and a spring. An upper pulling piece, a main cam, an auxiliary cam, a lower pulling piece, a large roller shaft and a small roller shaft are arranged in a moving chamber. The large roller shaft is connected with a drive roller. The small roller shaft is connected with a buffer roller. The main cam is provided with a continuous outer contour in the arc surface. A notch is formed in the main cam. The auxiliary cam is provided with an arc outer contour. An oil leak is formed in the head of the piston ad internally provided with a one-way valve. An upper cover is arranged on the upper portion of the moving chamber. The floor spring has the advantages that a double-cam structure is adopted to achieve 90-degree positioning and 90- to 180-degree optional positioning; connections such as a pulling rod of the traditional floor spring are omitted, and the spring at the tail is employed to adjust strength, thus the door opening and closing strength is adjusted.

Description

technical field [0001] The invention relates to a hydraulic door closer, in particular to a multi-stage positioning ground spring with adjustable door opening force that can be positioned at any point between 90° and 180°. Background technique [0002] The ground spring is a hydraulic door closer, except that the device that compresses the spring is a worm gear instead of a rack and pinion. Because the worm gear can rotate forward and reverse, the floor spring can be used for doors that open in both directions, while the door closer can only be used for doors that open in one direction. The worm gear structure of the floor spring makes the compression degree of the spring smaller than that of the rack-and-pinion door closer, and the force arm of the floor spring to close the door is also shorter, so the quality of the floor spring is more dependent on the structural design and machining accuracy. In addition, because the two-way door leaf has a great force on the floor spri...

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly aims at the problems that existing floor springs cannot be multi-point positioned and the opening and closing strength cannot be adjusted, and provides a door opening and closing that can not only adjust the opening and closing strength of the door leaf, but also realize the opening and positioning of 90-180 degrees. Force-adjustable multi-stage positioning floor spring

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